Corona top seed in Division 1

The 25-3 Panthers will open the CIF playoffs against El Dorado and pitching ace Frausto.

And so it begins. Call it May Madness. One of the toughest sports playoffs anywhere — Southern Section Division 1 baseball — begins Friday. Corona High, which was 25-3 in the regular season, earned the No. 1 seed Monday.

As proven by history, favorites sometimes have a difficult time winning the Division 1 championship. There are so many obstacles to overcome, such as top pitchers and road games, even though you’re the higher seed.

“This is the mecca of baseball. Everyone’s good,” Harvard-Westlake coach Jared Halpert said.

On paper, Corona looks like the overwhelming favorite. The team has not lost this season when either of its top two pitchers, Ethan Schiefelbein or Seth Hernandez, was the starter.

Yet there are teams that have been competitive with the Panthers and figure to be legitimate challengers. Corona will open Friday against El Dorado, which has its own top pitcher in AJ Frausto, so nothing will come easy. There’s also the possibility of a rematch from the Boras Classic final against Mater Dei, which received an at-large berth despite finishing last in the Trinity League.

Harvard-Westlake is seeded No. 2, Orange Lutheran No. 3 and Santa Margarita No. 4.

If Harvard-Westlake and Orange Lutheran advance to the semifinals, they’d meet for the fourth time this season. Defending champion JSerra opens against Bonita and could face HarvardWestlake in the second round if the Wolverines get past Norco. The championship game is set for May 17 or 18 at Lake Elsinore’s Storm Stadium.

Westlake received the No. 1 seed in Division 2 and Corona Centennial is seeded first in Division 3. There are eight divisions. St. Francis received an at-large berth in Division 4, its first playoff appearance since 2009.

Get ready for plenty of competitive openers. Harvard-Westlake and Palos Verdes played a 14-inning playoff game last season that required parts of two days to complete.